import numpy as np
a=np.array([2,23,4],dtype=np.float64)
print(a)
print(a.dtype)
b=np.zeros((3,4))
print(b)
c=np.ones((3,4))
print(c)
d=np.empty((4,4))
print(d)
e=np.arange(10,20,2)
print(e)
f=np.arange(12).reshape((3,4))
print(f)
g=np.linspace(1,10,6).reshape((2,3))
print(g)